I think I just solved this problem. I've been fighting with it for 3 days.
I have run the compatibility troubleshooter and it has recommended Windows 8.1 compatibility.
I now have it running.
It did change some settings in my active profile which it adopted from my 4.1 config. It changed line width and speeds.

I think I just solved this problem. I've been fighting with it for 3 days.
I have run the compatibility troubleshooter and it has recommended Windows 8 compatibility.
I now have it running.
It did change some settings in my active profile which it adopted from my 4.1 config. It changed line width and speeds.

I think I just solved this problem. I've been fighting with it for 3 days.
I have run the compatibility troubleshooter and it has recommended Windows 8 compatibility.
I now have it running.
It did change some settings in my active profile which it adopted from my 4.1 config. It changed line width and speeds.

This hasn't fixed the problem and I doubt that thingiverse is the issue as 4.1.0 loads without error.
I have reinstalled and it now gets past upgrading configuration and now sits at loading preferences.

I've been running 4.1 for a while and just installed 4.2.1. When I start it, the splash screen opens and cycles through loading plugins and then updating configuration. 2 hours later it is unchanged.
I have established that if I have my network disabled, it crashes pointing at the thingiverse plugin. I'm not sure if that is significant or not.

If you extrude 10mm of 1.75mm filament and print it as a stripe on the bed. You can measure the thickness and width of the extruded stripe and the length to calculate the volume extruded.
Its pretty easy to calculate the volume of 10mm of 1.75 diameter filament. If you compare them you can calculate a correction factor to extrude the correct amount of filament.
Stuart

Unfortunately, just changing colour in the same brand of filament can need almost all parameters changing, making a per material flow almost pointless. You will still need to adjust it in your profile. I generally print in eSun pla plus in white grey and black. They need very different profiles.

Its been rock solid for me, but I've now installed the 3.3.0 update and have the same problem. I've tried the same fix and it doesn't work. My video drivers are the ones provided by my laptop manufacturer. At the moment I cant get the latest intel driver to install over the top of it as it sees the manufacturer driver and refuses to update.